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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82a8618848693dd1f6e385755908aa480f188a41fb12fc4ef61f25ea56e86570' 
  AND token = 'Wa0xqRoGA5BpBGyjSfQ2NEwBSE7obT8u/OyFd6DbBf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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