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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d772a9cfd314d668b4011e0678e95ad2f3e093f775b51e0a12a99794e6ba23' 
  AND token = '32g//1wEamsuCtrj+It+bc3D1cdY3zsKrI47ucT1Oog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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