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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f619f8bde38697b308128c1ac4a7b051ddd3271a4e820ac804ec6924a1fbe3' 
  AND token = 'N9r+AHqcueRcefJnX8/Hq/xQdI9LeAr//i/yCE7O184=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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