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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c9b1d61f20ef594b02aa81d2712c1fb9064ec4cc6c16043e23c49b17f157285' 
  AND token = 'P2VZxb0ddMP5nD3N4iF4ee6PVbMQaDZKPoUGdXC1sYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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