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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e6f3db43aac52a59a3988ca88f22df2f2cba02bff6f88991aa7780ad232e35' 
  AND token = 'tL9+GcH68uQnmoE+1jB8n1iDto3CqP+XfBqz77KsZvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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