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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20858d423471114d4289f245f3d71b8c8815f74ca6786ba00603cf8e150ed5ee' 
  AND token = 'Lo5Rzf8OW3AK6MnCNEbBTRAQ5t4yw7jeRlUWP9rBO+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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