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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47ae7a5e9bba1b97c066bec72a5f09c00209beb3cdc6931908c20afdede27537' 
  AND token = 'BPcC5j3Ooiqm+98SmRn1tKXsYppj52y+pyHkAXaUiM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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