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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cd2ef306649ba1790e2f687e2fb5291face9cac133b56799343214527661975' 
  AND token = 'BhasnB/QD/rBGBJmhacC70MtgAB9Nhcag2pKn/a6p54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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