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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f56cf9c7375c0feb2e73212782287900a6c8c5fe40328ab839e66ca0e2f4562' 
  AND token = '5mg3wIIc728HLT0ptsmx8oKHhm0I7tNBEBNMTSN3QzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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