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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91462e207351c1e773b6120844ea12b3ead3a66032214c24e9d33c4fffbaefb5' 
  AND token = 'HcEjKNGxat01SE7YtL+tdpiCNZ80AEqtTpyt26pQE6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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