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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e55bf7011b72b36a71d8728fb8314e2deab8cdfba5a71453fe3a45ae2100a559' 
  AND token = '06/bRWfmLudzMKCrNer5/ZgEMz1keDST0InHW51z2y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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