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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac03ece096d9b422418eacb8f1849704e2c13e78a35c9fc992b6ddf9dc532c9' 
  AND token = 'aiVrnkYe72Nb1RWATX6bJ3ZVbHG7+IFAj+jOw7eBfkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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