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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5912fa8745a51e33bb0d06b5878bc7e47b8f2c0e9d63d25c03bbc6d5cdb027bc' 
  AND token = 'lTCVZ2DEjdChUCDWhIxxJCzeI3ocYpgcmM5k7wX+Seo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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