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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c4637bc2e8289f0fe67f42275dc020c46486027edc4a52473ab84de1426c674' 
  AND token = 'n7Ja0rQkV+Uv8mnVhHaCWc7HVQXFHlBAHT/X8toN4HY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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