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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7524ee78f97ff898176bca059a36775b44fdb7661682688fe31609c818a6ccb' 
  AND token = 'FZUWM43OiJwGtE7tocqcrBG3N/0h/BsQBAt4LpEPQwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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