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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3de6ea82373ca6f8a421ac4dc623853c1234d93c348af1b3a45aaedfb848a9d' 
  AND token = 'XNFo8F+iHxcjT8k+bRVohF/Sp7FVzWACg3+0x+NUYfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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