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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62489a74debc88c69b5b0dd51028543dfb90ff37e27f734a8f14ed50f9253f62' 
  AND token = 'Gy4hEVGd9uZQ/oEZSsdC1Z+1v3vrMXe197zaS8xmLLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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