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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e125d6007aee3e02fdc8c41976b0e4c15ec61671ab52fa6236036de58583628d' 
  AND token = 'fu/091QXQKPjbTFwYfrTAWW/Iey6NS4hE5LLfIV+d64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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