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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2485a85f13818404932fdcf4e88c5ea07f2670c8f3bb7a7731f0e47cc016f523' 
  AND token = 'TIAAzV/8NaV43GyOAG19T5e6zRNRuFsIzHdhuchmNY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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