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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8740438699411738d42dbb7589032709e2ff4c225420654be85f659a617933d9' 
  AND token = 'zHwX9Su/CaYGcPl9v8TdlhXudbp3FJaSHTtRd1l4rOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}