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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d42c20488e7fdda989c104a261c2ea938cfdc0b8f11cd90fbb7ff15fe8cd535' 
  AND token = 'c0LkJSvNbnrxVongD58u4aaE6TApolawdpXfuw3m6BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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