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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f124a60607945f859742e3f6a3c57cf9d072e020abc0bd2507dc3a275af4c11' 
  AND token = 'igeIhr96u19ZL0yprVdbXt4ri+VcP99del0z6BqEUwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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