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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dfb11402df1528c1e508a77edb1b19b4360fc0d450dbd48a21f51f672aa83bb' 
  AND token = 'PgL29cfFjJBl0G11fEdYekagv51Mh7dXPfxGK2M7qIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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