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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f507727516e162985dd90e12572290fb2b442eb53a2b3f27f09521d0bb2c70c' 
  AND token = 'rFFwTnmJzapA/3lTRcDXIFho7J9MXxxfcaNQ/5bAQv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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