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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe88204cce0194e81b03aaf08cc56fa060988612dd3a7a04903605d5f234171' 
  AND token = 'FeCxudj2XUALaZV6t5/DLvHbKW8lni6ynGC6iN5KA7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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