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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b36cc9f47696c79384e1c5f824db49103f3380c4c0796f8f1b61e6b8c081c5' 
  AND token = 'mSJnoWLDmU1Y7rd03bYmevCTCctJt1M+CGjRtByxrQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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