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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25d3dc824516c985d63190d0d473a09ec159249aaeb3c11bf60abcb1380608c0' 
  AND token = 'iv68NKazSCfAO5Ry50ss/F2hn2Zegng9CnInVd+vV8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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