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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03ff780408e1d0b6d41f32785bf58e911940fbea9d73a9d9938d8eed3341be60' 
  AND token = 'Q6mMX2H78rHvyOm4P/fJG3rB4vN4sVwTJ+aPLMNNO7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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