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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7ab1f18c35ab6c0ec69e1e8fd540ddd0d134f62d033837417a8f6ee52d5e249' 
  AND token = 'ZcV1geJ/oDQvd98zpAlqJIuydfvitYoegh5bBnW4F+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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