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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c819e89bae5f7f3f044492108dc2acd1ef0c6cf5f4069fe0e5e4668c0bee4484' 
  AND token = 'cpqFUR8pl7px7aVnj9Jlbrdj5OP83rsc7jFOK2leMZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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