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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02fb7ff208a6224938002b751455db5b630a38fdd1b4be32e8e81deb3ceb68d3' 
  AND token = '6z3iBduayE8Il1fXnmLHu9hgTQTTo/QFYUyUASwg/SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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