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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d7753437de82e85a27f958bb1f4d20b562adaf2d9ac3f2ec4d5b3cbed235fd6' 
  AND token = 'ILQtMf9W+GCm1sNFsT9yKeLIH3WDYpG9Ylr44kOLmy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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