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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5167a56f5aa9899902fba51d294965c3f1c676242ca115da2ff56ef1c919ca9c' 
  AND token = 'FY+KKRE6Y71o8+SBHu6ARQRPAH2eo6NkbNxUdPIB0y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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