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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cedb53b6d71f5b3ebffa31b94f5502433da94e9d54dbef3373cab641a704a44d' 
  AND token = 'AnWnebJGrG7gkTyTHjBXv8UwJ7iCEUFI2gaO1eY4QoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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