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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a72a92202b73289dc6c7fccecec3da23fb3ea5cbe795a1ca8aa7dd8decb67fb8' 
  AND token = '2dIwMlo9ZAkWzAK71ZI12P/kKLtObSpMXCcJ+WT8gAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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