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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d62d073f2f9a52bb2f44faadb245035e2fd83bc39345c987acd6aec9cf3f6a0' 
  AND token = 'seMUsOOUjsoE/O4Npv9C8TTghr4c2EXQOPehm/vVspE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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