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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f103f1a0cb6b3d6860168ef86d825b343d3562fb75169f85b1e98b594970f8' 
  AND token = 'WiHL2sfg7DN3a7j+bn3/8WJl4JCJ7Z0CDRWYKvOttMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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