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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffecff231dfe6f0595377446bf48a5c023760315116773ca1890111a6d29a547' 
  AND token = 'hSrd661j7H3iQmRZ1Q6dy5TaZH9Cf+71Bq0Fo07IPBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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