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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2746ce826a55886e8fd061ce11189929f58da90492b5d5e72d1c60fcb4950cab' 
  AND token = 'sGwxgCjWZOLbuqvgPGU8K1ncqsLnmUvOTZHk96kevU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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