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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2aad471b256319355f184cc3331b16d6e47177b7b2aef3c687abe5ef298bd94' 
  AND token = '7rK3PiES7XtNQqVpWu9G9m8fBSpC3YW1x4knwz1XiiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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