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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb5d56d1833e96a6bb8e921441287fa668ba66b6b734f82061471161d67d2416' 
  AND token = 'gX5Wes9TlNGCCFuAiBHCsGLAuafPHDLKwZHYhTmH2Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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