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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48d1ec16fe944f298d01b64baecb6975a1dac1ea97af94a54812087760e9fac0' 
  AND token = 'qS68N3wq8Au0EbYrjefXUd9BVYaoTznhqamFo5pk5QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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