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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2acca4060c436e5faa34319ab2d6dc6f9cf57a79a87fa027e2b1c13bca316d14' 
  AND token = 'UVQ7RRjNJPex9PsPBUd7QO7apZ1YVzjZTOCNpGeoeyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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