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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c60336d994aeec0a18ba3089858555d5877f05f0a725632a554fc93c5d704adf' 
  AND token = '7UEGh7bmgTDeDA+Pm5CaT5OALxlHkGC6LN0aBdVF/ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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