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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f7d8b97149ea3ed4a18632cfd35a5d8ee985b101cd9fec9933ba91d17ad628' 
  AND token = 'Y7/Zku4N1Z7q54WbDczOdqnlXqA5dcjkBqGl8Tzkhn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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