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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc199d665869faeeeeff290e629f484f109107daa0057dff28dab9559c237859' 
  AND token = 'Gh0o5VQT/VA6skznF8qR9O7LZ7Fy57jdth0vhFtj8Gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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