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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c23e02218249d042ce904a4d6afda6f46e30ff3bd65f516683fe5c259a8dfc5' 
  AND token = 'bt5wkvwMESjH0/3W5L45X0W1S/m7jZq2ehGFWstos0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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