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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6f23721835803739c365cc887af08caf61ec42deb2b9a6f008aa86e0ee06f8' 
  AND token = 'mFymb8WSdt1h7yHGb+YYng5i0BDDugGOnMHD2mYkCqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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