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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe2f266fc1a5d5c472cb2ae5bb51d7d9f344b08bf1168acd2b22fb1cb4d1990' 
  AND token = 'RQrKlELlhKlPaR2Dg5EZS79k8sbR32D6Dgp4v6j+r3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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