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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ec0686d87eeb2faeda66d4207f1b518b5ac299ee358379515c3e8e47910fba6' 
  AND token = '1RLVwJPHKhEwej2FhTIGEnCzu8lPT9voAm9r3dtX7fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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