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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '663314ca28155e34e23706a5abb1c8941037a46b88de3a79f854aa76eb09d9e0' 
  AND token = '3cvCwaWFbpjs8y2D81407zkdWcVm8R5x6a0x1nxEUjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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