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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab5d1033c10c9de2c6aea9b489169e227286917fee9230bb21ec23c93b1db6fb' 
  AND token = 'syds290P7Ph6QUFhTKly8NNbVtPTjDVo8YWTSSiLONg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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