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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9cbad36482d62674edb8cbb8f9617d98f432ba284f0202749d1d89faa28cda5' 
  AND token = 'RwZepr8TL1a7V1yEBjeKHOmuQAaIko902CuH0l322sQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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