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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c771b59773805b229a0f883bcc363a52563cea99844e3a6ff583f0eae038333b' 
  AND token = 'pPfsOjoeIqyc6V0LlkDYhKp2zNjmxDC0sAHRW2A2uBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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