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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bc091a526f640f0a28c424db6705764e81b572c7fa7ce34f1470cf791b66178' 
  AND token = 'rSCMACpd0FuB1pCw7owmcpBO3PSlpnyfeQCwq+Sa5qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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