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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f8b02838964d4b9f7e75f2417eeabd2e87101f581ff41df9e389ce17f3fe279' 
  AND token = 'CgxbPswAbH8Kqm/oQLv4EM1/WOf59sQQPEIiqooS5+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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