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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8775fda052e653505eee59de8907012a94c0620792c0ace3f6f420de79999665' 
  AND token = 'io1UTT5RXMFEB8YWHgAYJU9tENL4fh24LoF+j7l5xw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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