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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5689384bfacdd0678e102754dd38947752c676530cd5b6209e47befba353d134' 
  AND token = 'W7Zm4aLd7BdG5gss7lUDjKn225i2NGwDibePPl6EbhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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