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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e47b6311a3f778b7a939c1ea5ec3c8b9076ea79b0924287b6d3bbe710d95f1a8' 
  AND token = 'AI9e/rY1Ist/kDRCctxDCWN+7xeiOIqmyGTBxOFHMZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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