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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60d6726181790ecbf8e478f8ebdeae6d4b52c16aec8daf1cbbb02d79f6f71401' 
  AND token = 'MFLX8r0Ke5ZOf7bI9YW2p8Gg/KsHg/kr4hsO8XM7m7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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