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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb9b5b36751f655c3ce8c5c98b899395c9e28b457f0d505c25e90c47754d9a3' 
  AND token = 'qvoAR6Yq1SrbMAPbhdvJyfzvwooALRL9WE0OXsqEPh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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