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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e319d306ba62eae5a42cfce851d496555c04476233d3d09212ad70943bb8403b' 
  AND token = 'crn9QRLPHs9QAMRp14kDvb16XAEsIZRPQl4lGyWPLD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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