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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2918a3075fd638d7a92427edc79887a5d81d457bfeb60e86017fe84585cec2d4' 
  AND token = '+xnfKJXStBW5X7Vaeoefyr7aRNrCLViR658Lh7t09W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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